Chemical Engineering MCQs

Page No. 14

Which is a regenerative furnace ?


aCoke oven heating chamber

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bOpen hearth furnace

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cBoth A. and B.

✓


dNeither A. nor B.

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View Answer Both A. and B.

Fertiliser produced during soda ash manufacture by dual process is ammonium______________________?


a Chloride

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b Sulphate

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cNitrate

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dNone of these

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View Answer Chloride

In order to maintain an oxidising atmosphere in a furnace, it should have__________________?


aMore of excess air

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bLess of excess air

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cMore of CO in flue gas

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dMore of CO2 in flue gas

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View Answer More of excess air

Electric process as compared to wet process (for the manufacture of phosphoric acid) ?


aCan use only high grade phosphate rock

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bIs used less frequently

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cProduces a valuable by-product called gypsum

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dIs weak acid process

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Rock phosphate constitutes mainly of___________________?


aFluorapatite

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bDi-calcium phosphate

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cMono-calcium phosphate

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d Di-ammonium phosphate

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View Answer Fluorapatite

Pick out the wrong statement ?


aMomentum transfer in laminar flow results from velocity gradient

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bA fluid in equilibrium is not free from shear stress

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cThe viscosity of a non-Newtonian fluid is a function of temperature only

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dBoth B. and C.

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View Answer Both B. and C.

Iron is not used alone as a catalyst in ammonia synthesis, because___________________?


aIts activity declines rapidly, if heated to above 520°C

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bIt decomposes ammonia

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cIt gets oxidised above 500°C

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dNone of these

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Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?


aEmissivity of the refractory walls

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bSize of the furnace

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cUse of waste heat recovery equipments

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dThickness of the stock

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Pick out the correct statement?


aA forced vortex occurs when fluid rotates as a solid about an axis

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bIn laminar flow, Newton’s law of viscosity does not apply

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cA free vortex occurs, when fluid rotates as a solid

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dIn turbulent flow, there are neither cross-currents nor eddies

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Phosphoric acid is produced in wet process from phosphate rock and____________________?


a Dilute H2SO4

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bConcentrated H2SO4

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cConcentrated NHO3

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dConcentrated HCl

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View Answer Dilute H2SO4

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